Why do you think Santa Claus chose flying reindeer to pull his sleigh? That doesn't sound like a good choice to me. If i was Santa, i would've used flying monkeys.
Think about it. Flying monkeys would be awesome in the air. They have wings. They'll probably be a lot faster. What do reindeer have? Magic? Fuck that. We all know well enough from watching Harry Potter and Lord of the Rings that there's always counter-magic. What if Santa runs across Voldemort or Sauron somewhere over the Atlantic Ocean? He's going to be shark food, and all of our presents are going to be completely waterlogged. If my Tickle-Me TurboTubbie gets turned into fishfood, ima be pretty pissed off.
And you know what else flying monkeys have that stupid reindeer don't? Hands. That's right, they could grab some presents and help throw them around. Santa could be a lot more efficient. He's obviously not in that great shape - all the motherfucker eats is cookies. Now he's got a portable worker crew to help him out.
Plus i'd bet the flying monkeys would be a lot better in case Santa ran into trouble. What if he ran into a pack of mutant vultures, or a missle, or an alien looking to score some anal probe time? Well what would reindeer do? Huff at them and sing the first verse to Rudolph? Not monkeys, fuck no. They're mean as hell. I mean, they were created by the Wicked Witch. Yeah, they'd totally fuck up ET's shit, then rip out his asshole and hang his intenstines from the sleigh like fucking garland. That's totally what flying monkeys would do.
Plus, the monkeys like to wear suits. Santa could dress them up like elves. How cute would that be! What can reindeer wear? A collar? Who gives a fuck!
We do, of course, have to look at the downsides. When waiting up on the rooftops, there's be a lot less click-click-click and a lot more throwing of shit. We'd probably have to start cleaning off our roofs the day after Christmas before it really started to smell. The monkeys would also probably be throwing shit at each other, so any cartoons or pictures we make of them would have to take certain liberties.
Overall, i believe this is the best decision. When writing our letters to Santa next year, we should recommend this. He could still put the reindeer to a use once they've retired. Imagine how delicious a deer steak Blitzen would make! Yum!